单项选择题

Only when he had done it ______ that he had made a mistake.

A. he then realized
B. he realized
C. did he realize
D. before he realize
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单项选择题
I bitterly regret ______ him the story yesterday.
A. to tell
B. told
C. to have told
D. having told
单项选择题
His shirt needs ______.
A. mending
B. to mend
C. mended
D. being mended
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